/*******************************************************************************
 * Copyright (c) 2005 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 ******************************************************************************/
package org.eclipse.swt.custom;

import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.internal.SerializableCompatibility;
import org.eclipse.swt.widgets.Control;

class CLayoutData implements SerializableCompatibility {

  int defaultWidth = -1, defaultHeight = -1;
  int currentWhint, currentHhint, currentWidth = -1, currentHeight = -1;

  Point computeSize( Control control, int wHint, int hHint, boolean flushCache )
  {
    if( flushCache )
      flushCache();
    if( wHint == SWT.DEFAULT && hHint == SWT.DEFAULT ) {
      if( defaultWidth == -1 || defaultHeight == -1 ) {
        Point size = control.computeSize( wHint, hHint, flushCache );
        defaultWidth = size.x;
        defaultHeight = size.y;
      }
      return new Point( defaultWidth, defaultHeight );
    }
    if( currentWidth == -1
        || currentHeight == -1
        || wHint != currentWhint
        || hHint != currentHhint )
    {
      Point size = control.computeSize( wHint, hHint, flushCache );
      currentWhint = wHint;
      currentHhint = hHint;
      currentWidth = size.x;
      currentHeight = size.y;
    }
    return new Point( currentWidth, currentHeight );
  }

  void flushCache() {
    defaultWidth = defaultHeight = -1;
    currentWidth = currentHeight = -1;
  }
}
